Cautionary notes

If you observe the following simple points when commissioning your geothermal borehole project, you may save significant amounts of money and aggravation.

The investment in a GSHP with a borehole, or borehole array is a significant one and should not be put at risk by making the wrong choice at the outset...

Beware, of anybody that recommends multiple boreholes of less than 70 metres depth (unless there is a good, documented, geological reason).

Go For, a company that can demonstrate the ability to provide borehole array design, utilising boreholes of up to 150m depth or more.

Beware, of anybody who says that putting geothermal boreholes closer together than 6m is a good idea, it is usually not.

Go For, a company that will recommend spacing of more than 7m within your cost and space constraints.

Beware, of anyone that simply tells you that less than 20m of borehole per kW of rated heat pump capacity is sufficient; unless they can produce geological survey data or professional calculations to back this up.